IntFlags flags = IntFlag.undef | IntFlag.posOver | IntFlag.negOver;
flags &= IntFlag.posOver | IntFlag.negOver;
assert(!(flags & IntFlag.undef));
flags -= IntFlag.undef | IntFlag.negOver;
assert( flags & IntFlag.posOver);
assert(!(flags & IntFlag.negOver));
Test (&), set (|), or unset (-) individual flags.